package lab02.test36;

public class Postgraduate extends Student {
    @Override
    String calaGrade() {
            //得到该生的成绩
            double avg = calAverage();
            if (avg >= 90 && avg <= 100)
                grade = "优秀";
            else if (avg >= 80 && avg < 90)
                grade = "良好";
            else if (avg >= 70 && avg < 80)
                grade = "一般";
            else if (avg >= 60 && avg < 70)
                grade = "及格";
            else
                grade = "不及格";


            return grade;
        }
    }

